A patient presents with a deficit in the sensation of pain and temperature on the left side of his body, but no other sensory deficits. Which region of the white matter in the spinal cord has most likely been damaged?
A. Dorsal spinal cord on the right side
B. Dorsal spinal cord on the left side
C. Ventral spinal cord on the right side
D. Ventral spinal cord on the left side